Simplify the expression $8s\times5t\times2u\times6v$8s×5t×2u×6v.

Simplify the expression $\frac{8m}{32}$8m32.

Simplify the expression $9a\times5u\times10t$9a×5u×10t.

Simplify the expression $\left(-9n\right)\times2$(−9n)×2.